3Com OfficeConnect 56K Business, Command Reference Manual

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8 G
LOSSARY
local echo A modem feature that enables the modem to send copies of key-board
commands and transmitted data to the screen. When the modem is in
Command mode (not online to another system) the local echo is
invoked through the ATE1 command. The command causes the modem
to display your typed commands. When the modem is online to
another system, the local echo is invoked through the ATF0 command.
This command causes the modem to display the data it transmits to the
remote system.
MB Megabyte. One million bytes.
Microcom
Networking Protocol
(MNP)
An asynchronous error control protocol developed by Microcom, Inc.
and now in the public domain. The protocol ensures error-free
transmission through error detection (CRC) and retransmission of
errored frames. 3Com modems use MNP Levels 1-4 and Level 5 data
compression. MNP Levels 1-4 have been incorporated into ITU-T
Recommendation V.42. Compare HST.
MI/MIC Mode Indicate/Mode Indicate Common. Also called fixed or manual
originate. Used when equipment other than the modem does the
dialing. In such installations, the modem does not respond to AT
commands, but when taken off hook immediately goes into call
originate mode.
MNP See Microcom Networking Protocol.
modem A device that transmits/receives computer data through a
communications channel such as radio or telephone lines. The Business
Modem is a telephone channel modem that modulates, or transforms,
digital signals from a computer into the analog form that can be
carried successfully on a phone line. It also demodulates signals
received from the phone line back to digital signals before passing
them to the receiving computer.
Nonvolatile Random
Access Memory
(NVRAM)
User-programmable random access memory whose data is retained
when modem power is turned off. Used in modems to store a
user-defined default configuration loaded into random access memory
(RAM) at power on.
NVRAM See Non-volatile Random Access Memory.
online fallback A feature that allows high speed error-control modems to monitor line
quality and fall back to the next lower speed if line quality degrades.
The modems fall forward as line quality improves.